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				@ -152,11 +152,12 @@ class Participants extends RedisModel { 
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				        let self = this; 
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				        let participants_key = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipants, sessionId); 
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				        let user_session_key = RedisModel.makeRedisKey(REDIS_KEYS.UserSessions, userId); 
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				        let participants_role_key = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipantsRole, sessionId); 
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				        // 移除会话中的成员信息,用户的Session信息及MySQL中的记录 
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				        redis.multi() 
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				            .zrem(participants_key, userId) 
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				            .zrem(user_session_key, sessionId) 
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				            .hdel(participants_role_key,userId) 
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				            .execAsync() 
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				            .then(function (res) { 
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				                self.deleteUserFromMysql(sessionId, userId); 
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